Roller-mill for grinding and crushing.



No. 674,7!8. Patented May 2|, l90l. J. C. WEGERIF.

ROLLER MILL FOB GRINDING AND CRUSHING.

(Application filed Sept. 6, 1900.) (No Model.) I 3 Sheets-Sheet l.

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N0. 674,7l8. Patented May 2|, l90l. J."C. WEGERIF.

ROLLER MILL FOR GRINDING AND CBUSHING.

(Application filed Sept. 6, 1900.)

3 Sheets-Sheet 2.

(No Model.)

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Patented May 2|, l90l.

J. c. WEGEBIF. ROLLER MILL FOR GRINDING AND CRUSHING.

(Application filed Sept. 6, 1900.)

(No Modal.) 3 Sheets-Sheet 3.

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ATENT JOHANNES OHRISTIAAN WEGERIF, OF LEIGH-ON-SEA, ENGLAND.

ROLLER-MlLL FOR GRINDING AND CRUSHING.

SPEGIFIGATION forming part of Letters Patent No. 674,718, dated May 21, 1901.

Application filed September 6 1900. Serial No. 29,181. (No model.)

To ctZZ whom it may concern:

Be it known that I, J OHANNES CHRISTIAAN \VEGERIF, civil engineer, of Leigh-on-Sea, in the county of Essex, England, have invented new and useful Improvements in Roller-Mills for Grinding and Crushing, (for which an application for a patent has been filed in Great Britain, dated January 11, 1900, No. 662,) of which the following is a full, clear, and exact description.

My invention relates to improvements in hyperboloidal roller-mills for crushing and grinding, in which the axes of the rolls cross or lie in planes oblique the one to the other, so that the planes of rotation of the rolls are oblique to each other,-and consequently the particles passing between the grinding-faces of therolls are subjected to a tearing or disruptive action. With the ordinary hyperboloiclal rolls this obliquity of the roll-axes involves one or both axes being situated out of the horizontal plane, in consequence whereof an undue proportion of the pressure comes upon the bearing at the lower end of the roll, thereby very seriously affecting the efficiency of such rolls. My invention obviates this evil, the axes of both rolls being perfectly horizontal, which gives yet another advantage in that it enables the rolls to be mounted in the way most suitable in practical millwork, as more fully described hereinafter.

In order to obtain the maximum efficiency, it is essential that the crushing-rolls be pressed together not only with a mere downward pressure directly proportional to the load, but with an increased pressure, due to a Wedgelike action of the upper roll consequent on the axis of that roll being constrained to remain in a different vertical plane from that in which the axis of the other roll is situated. With rolls thus partly superposed the one above the other the direction in which the material to be crushed enters between the rolls is more or less approaching the horizontal and should be wholly in a downwardly-inclined direction, and in order to insure an even distribution of the material along the line of contact or bite it is essential that this line of contact or bite of the rolls should itself be as nearly horizontal as is possible, so as to avoid interfering with the disruptive action set up by the hyperboloidal rolls in order that the material may not tend to gravitate toward one end.

It is the object of this invention to produce a machine in which these features are combined. In the case of rolls whose axes are oblique to one another and whose acting surfaces are consequently of concave hyperboloidal configuration it is necessary in order to prevent undue pressure on the bearings, with its attendant heating, loss of power by friction,&c. that the axes of both rolls should always be in horizontal planes. A mill so constructed is illustrated in the accompanying drawings, wherein Figure 1 is a diagram of a pair of rolls, illustratingin a highly-exaggerated manner a pair of crossed rolls of truncated concavo-conoidal form according to my invention, the feed side of the rolls being supposed to be at the side farthest from the observer. Fig. 2 is a diagrammatic elevation and plan view of the rolls as used in the mill illustrated, except that the actual concavity of the roll-faces, being so slight as to be hardly perceptible, is not apparent in this figure in consequence of the reduced scale and the shortness of the rolls. Fig. 3 is a side elevation, Fig. 4 a plan, and Fig. 5 afront elevation, of the mill, the driving-pulleys being omitted in Figs. 3 and 5. Fig. 6 is a part side elevation showing the pressure-lever and upper roll thrown back. Fig. 7 is a horizontal section and end elevation of one of the thrust-bearings.

A is the upper roll and B the lower roll, a a in Figs. 1 and 2 being the axis of the upper roll and b b the axis of the lower roll, the two axes lying in different horizontal and different vertical planes, the vertical planes beingoblique to each other. I

m at, Figs. 1 and 2, represent the line of contact or bite of the two rolls, this line being by reason of the conicity and concavity of the rolls botha straight and a substantially horizontal line.

The means of mounting the rolls consists, essentially, in journaling the upper orpressure roll A in a single frame 0, adapted to act as a pressure-lever, the said lever being composed of two side members a 0, cast in one,

together with a cross-bracing c. The lever I might otherwise ensue in consequence of an excess of material being fed in toward the one or the other end of the roll. Lateral play of the lever is prevented by the ends of the members 0 of the lever 0 being received in forked bearings E, which carry the fulcrumpins D, the said bearings being each carried by bolts F, which are anchored to the checks of the main frame G of the machine, or the bearings E might be otherwise suitably supported so as to resist the strain due to the wedge-like action of the roll A. The two side members c of the leverframe O converge symmetrically to a point 0 to form the long arm of the lever,

to which point the pressure (which may be spring, hydraulic, or other) is applied. The pressure being thus applied at a single point will necessarily be equally divided between the two ends of the roll, the end of the lever being suitably guided. The pressure is shown as being applied by helical springs S, confined between an adjustable fixed head 8 anda movable head 8, applied upon the endof the lever 0, both heads being on a guiderod T, anchored at t to the frame G, and upon which the forked end 0 of the lever 0 plays and by which it is guided, the lever in its lowest position resting on packing-blocks 15 In consequence of the lateral disruptive action due to the mutual obliquity of the planes of rotation of the two rolls there will be a lateral thrust of the rolls in opposite directions, to resist which the one journal of each roll is provided with a thrust-bearing H, as shown in Fig. 7, wherein his a circle of balls rolling in circular grooved paths in the end of the roll-journal and in a thrust-block H, adjustable by means of a screw H, working in a threaded cap bolted to the outer end of the journal-bearing.

The lower rollB is driven by a belt on a pulley I, and the upper roll A is driven by a rope band running on a grooved pulley J, (or a belt and pulley may here be used,) these pulleys being on the gudgeons opposite to those which are provided with thrust-bearings, dust-exclude'rs being provided for the bearings both at the inside and outside of v the bearings.

. rolls up to the line of bite, the feed-hopper being made adjustable so as tofit, notwithstanding the wear of the rolls.

The journals of the pressure-roll A are received and retained in capped bearings A in the lever C, so that by raising the lever and swinging it over backward to an inverted position, as shown in Fig. 6, the lever O and the pressure-roll A will be moved wholly out of the way to afford free access to the roll 13 below.

In the case of a three-high roll the lower one would be mounted in stationary bearings, the middle one in slide-block bearings, and'the upper one in a pressure-lever O, as above described.

Having now particularly described and ascertained the nature of the said invention and in what manner the same is to be performed, I declare that what I claim is 1. In a roller mill, rolls partially superposed and having their axes lying obliquely across each other, -in parallel horizontal planes and in different vertical planes, the rolls being of truncated concavo-conoidal or semihyperboloidal form, and both rolls being coned toward the same side of the machine, as described.

2. In a roller-mill for grinding and crushing, rolls partially superposed one above the other, the axes of the rolls lying in vertical planes oblique to each other, and in parallel horizontal planes, the acting surface of the rolls being slightly concave, and conoidal in form, the smaller ends of the rolls being at the same sideof the machine and the line of bite of the rolls being substantially straight and horizontal, an adjustable feed hopper or box for feeding the material downward to the line of bite, the said hopper inclosing at the sides the entry ti) the rolls up to the line of bite, and means for pressing the upper roll against the lower with a yielding pressure, the said pressure-roll moving in a vertical plane, as set forth.

3. In a roller-mill for grinding and crushing, rolls partially superposed and having their axes lying in vertical planes oblique to each other and in parallel horizontal planes, the rolls being of, truncated concavo-conoidal form and both rolls being tapered toward the same side of the machine, the vertical planes in which the axes of the rolls lie crossing each other outside of the line of bite of the rolls, as set forth.

4. A roller-mill for grinding and crushing, comprising two rolls partially superposed and having their axes lyingin vertical planes oblique to each other and in parallel horizontal planes, the grinding-faces of the rolls being slightly cohcave and both the rolls tapering toward the same side of the machine, one journal of each roll being provided with a thrust-bearing to resist the lateral thrust of the rolls in opposite directions, as set forth. 5. A roller-mill for grinding and crushing, comprising two rolls partially superposed and having their axes lying in parallel horizontal planes and in difierent vertical planes oblique roll-journal and in the thrust-block, as set forth.

Dated this 20th day of August, 1900.

J OHANN ES OHRISTIAAN WEGERIFA Witnesses:

T. W. KENNARD, O. J. CLARK. 

